OpenVPN 2.7_alpha1 through 2.7.7 allows remote authenticated users to impersonate others via a crafted certificate subject field (CVE-2026-84790)
Description
OpenVPN versions 2.7_alpha1 through 2.7.7 contain a vulnerability that allows remote authenticated users to impersonate other users by exploiting a crafted certificate subject field. This issue affects multiple specific OpenVPN package versions primarily on Ubuntu distributions. The vulnerability is rated medium severity based on the CVSS 4.0 vector provided. There is no explicit patch or remediation information available in the provided data.
CVSS v4.0
Affected software
pkg:deb/ubuntu/openvpn?arch=source&distro=esm-infra-legacy/trustypkg:deb/ubuntu/openvpn?arch=source&distro=esm-infra/xenialpkg:deb/ubuntu/openvpn?arch=source&distro=esm-infra/bionicpkg:deb/ubuntu/openvpn?arch=source&distro=focalpkg:deb/ubuntu/openvpn?arch=source&distro=jammypkg:deb/ubuntu/openvpn?arch=source&distro=noblepkg:deb/ubuntu/openvpn?arch=source&distro=stonkingpkg:deb/ubuntu/openvpn?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability identified as CVE-2026-84790 affects OpenVPN versions from 2.7_alpha1 through 2.7.7. It permits remote authenticated users to impersonate others by using a specially crafted certificate subject field. The CVSS 4.0 vector indicates the attack requires network access, high attack complexity, low privileges, no user interaction, and results in high confidentiality and integrity impact. The vulnerability does not affect availability and does not require additional privileges or scope changes. Multiple Ubuntu-specific OpenVPN package versions are affected.
Potential Impact
An attacker with remote authenticated access can impersonate other users by exploiting the crafted certificate subject field. This can lead to unauthorized access or actions performed under the guise of another user, impacting confidentiality and integrity of the VPN sessions. There is no indication of availability impact or privilege escalation beyond impersonation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the data. Until a patch is available, restrict remote authenticated user access and carefully validate certificate subjects if possible.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-84790
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 4.0
Threat ID: 6ad3f5582cdf04f65665e95a
Added to database: 10/17/2026, 22:23:20 UTC
Last enriched: 10/17/2026, 23:28:03 UTC
Last updated: 10/17/2026, 23:28:03 UTC
Views: 3
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